A real-time Raman spectroscopy study of the dynamics of laser-thinning of MoS2 flakes to monolayers

Transition metal dichalcogenides (TMDCs) in monolayer form have attracted a great deal of attention for electronic and optical applications. Compared to mechanical exfoliation and chemical synthesis, laser thinning is a novel and unique “on-demand” approach to fabricate monolayers or pattern desired...

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Veröffentlicht in:AIP advances 2017-12, Vol.7 (12), p.125329-125329-9
Hauptverfasser: Gu, Enyao, Wang, Qiyuan, Zhang, Youwei, Cong, Chunxiao, Hu, Laigui, Tian, Pengfei, Liu, Ran, Zhang, Shi-Li, Qiu, Zhi-Jun
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Sprache:eng
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Zusammenfassung:Transition metal dichalcogenides (TMDCs) in monolayer form have attracted a great deal of attention for electronic and optical applications. Compared to mechanical exfoliation and chemical synthesis, laser thinning is a novel and unique “on-demand” approach to fabricate monolayers or pattern desired shapes with high controllability and reproducibility. Its successful demonstration motivates a further exploration of the dynamic behaviour of this local thinning process. Here, we present an in-situ study of void formation by laser irradiation with the assistance of temporal Raman evolution. In the analysis of time-dependent Raman intensity, an empirical formula relating void size to laser power and exposure time is established. Void in thinner MoS2 flakes grows faster than in thicker ones as a result of reduced sublimation temperature in the two-dimensional (2D) materials. Our study provides useful insights into the laser-thinning dynamics of 2D TMDCs and guidelines for an effective control over the void formation.
ISSN:2158-3226
2158-3226
DOI:10.1063/1.5008441